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freebsd/usr.sbin/traceroute6/traceroute6.c
Jens Schweikhardt 9d5abbddbf Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup, 
especially in troff files.
2003-01-01 18:49:04 +00:00

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/* $KAME: traceroute6.c,v 1.42 2001/05/08 04:36:41 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
/*
* traceroute host - trace the route ip packets follow going to "host".
*
* Attempt to trace the route an ip packet would follow to some
* internet host. We find out intermediate hops by launching probe
* packets with a small ttl (time to live) then listening for an
* icmp "time exceeded" reply from a gateway. We start our probes
* with a ttl of one and increase by one until we get an icmp "port
* unreachable" (which means we got to "host") or hit a max (which
* defaults to 30 hops & can be changed with the -m flag). Three
* probes (change with -q flag) are sent at each ttl setting and a
* line is printed showing the ttl, address of the gateway and
* round trip time of each probe. If the probe answers come from
* different gateways, the address of each responding system will
* be printed. If there is no response within a 5 sec. timeout
* interval (changed with the -w flag), a "*" is printed for that
* probe.
*
* Probe packets are UDP format. We don't want the destination
* host to process them so the destination port is set to an
* unlikely value (if some clod on the destination is using that
* value, it can be changed with the -p flag).
*
* A sample use might be:
*
* [yak 71]% traceroute nis.nsf.net.
* traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
* 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
* 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
* 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
* 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
* 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
* 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
* 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
* 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
*
* Note that lines 2 & 3 are the same. This is due to a buggy
* kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
* packets with a zero ttl.
*
* A more interesting example is:
*
* [yak 72]% traceroute allspice.lcs.mit.edu.
* traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
* 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
* 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
* 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
* 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
* 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
* 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
* 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
* 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
* 12 * * *
* 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
* 14 * * *
* 15 * * *
* 16 * * *
* 17 * * *
* 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
*
* (I start to see why I'm having so much trouble with mail to
* MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
* either don't send ICMP "time exceeded" messages or send them
* with a ttl too small to reach us. 14 - 17 are running the
* MIT C Gateway code that doesn't send "time exceeded"s. God
* only knows what's going on with 12.
*
* The silent gateway 12 in the above may be the result of a bug in
* the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
* sends an unreachable message using whatever ttl remains in the
* original datagram. Since, for gateways, the remaining ttl is
* zero, the icmp "time exceeded" is guaranteed to not make it back
* to us. The behavior of this bug is slightly more interesting
* when it appears on the destination system:
*
* 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
* 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
* 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
* 7 * * *
* 8 * * *
* 9 * * *
* 10 * * *
* 11 * * *
* 12 * * *
* 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
*
* Notice that there are 12 "gateways" (13 is the final
* destination) and exactly the last half of them are "missing".
* What's really happening is that rip (a Sun-3 running Sun OS3.5)
* is using the ttl from our arriving datagram as the ttl in its
* icmp reply. So, the reply will time out on the return path
* (with no notice sent to anyone since icmp's aren't sent for
* icmp's) until we probe with a ttl that's at least twice the path
* length. I.e., rip is really only 7 hops away. A reply that
* returns with a ttl of 1 is a clue this problem exists.
* Traceroute prints a "!" after the time if the ttl is <= 1.
* Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
* non-standard (HPUX) software, expect to see this problem
* frequently and/or take care picking the target host of your
* probes.
*
* Other possible annotations after the time are !H, !N, !P (got a host,
* network or protocol unreachable, respectively), !S or !F (source
* route failed or fragmentation needed -- neither of these should
* ever occur and the associated gateway is busted if you see one). If
* almost all the probes result in some kind of unreachable, traceroute
* will give up and exit.
*
* Notes
* -----
* This program must be run by root or be setuid. (I suggest that
* you *don't* make it setuid -- casual use could result in a lot
* of unnecessary traffic on our poor, congested nets.)
*
* This program requires a kernel mod that does not appear in any
* system available from Berkeley: A raw ip socket using proto
* IPPROTO_RAW must interpret the data sent as an ip datagram (as
* opposed to data to be wrapped in an ip datagram). See the README
* file that came with the source to this program for a description
* of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
* vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
* MODIFIED TO RUN THIS PROGRAM.
*
* The udp port usage may appear bizarre (well, ok, it is bizarre).
* The problem is that an icmp message only contains 8 bytes of
* data from the original datagram. 8 bytes is the size of a udp
* header so, if we want to associate replies with the original
* datagram, the necessary information must be encoded into the
* udp header (the ip id could be used but there's no way to
* interlock with the kernel's assignment of ip id's and, anyway,
* it would have taken a lot more kernel hacking to allow this
* code to set the ip id). So, to allow two or more users to
* use traceroute simultaneously, we use this task's pid as the
* source port (the high bit is set to move the port number out
* of the "likely" range). To keep track of which probe is being
* replied to (so times and/or hop counts don't get confused by a
* reply that was delayed in transit), we increment the destination
* port number before each probe.
*
* Don't use this as a coding example. I was trying to find a
* routing problem and this code sort-of popped out after 48 hours
* without sleep. I was amazed it ever compiled, much less ran.
*
* I stole the idea for this program from Steve Deering. Since
* the first release, I've learned that had I attended the right
* IETF working group meetings, I also could have stolen it from Guy
* Almes or Matt Mathis. I don't know (or care) who came up with
* the idea first. I envy the originators' perspicacity and I'm
* glad they didn't keep the idea a secret.
*
* Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
* enhancements to the original distribution.
*
* I've hacked up a round-trip-route version of this that works by
* sending a loose-source-routed udp datagram through the destination
* back to yourself. Unfortunately, SO many gateways botch source
* routing, the thing is almost worthless. Maybe one day...
*
* -- Van Jacobson (van@helios.ee.lbl.gov)
* Tue Dec 20 03:50:13 PST 1988
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <err.h>
#ifdef HAVE_POLL
#include <poll.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <netinet/udp.h>
#ifdef IPSEC
#include <net/route.h>
#include <netinet6/ipsec.h>
#endif
#define DUMMY_PORT 10010
#define MAXPACKET 65535 /* max ip packet size */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
#ifndef FD_SET
#define NFDBITS (8*sizeof(fd_set))
#define FD_SETSIZE NFDBITS
#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
#endif
#define Fprintf (void)fprintf
#define Sprintf (void)sprintf
#define Printf (void)printf
#ifndef HAVE_GETIPNODEBYNAME
#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
#define freehostent(x)
#endif
/*
* format of a (udp) probe packet.
*/
struct opacket {
u_char seq; /* sequence number of this packet */
u_char hops; /* hop limit of the packet */
struct timeval tv; /* time packet left */
};
u_char packet[512]; /* last inbound (icmp) packet */
struct opacket *outpacket; /* last output (udp) packet */
int main __P((int, char *[]));
int wait_for_reply __P((int, struct msghdr *));
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
int setpolicy __P((int so, char *policy));
#endif
#endif
void send_probe __P((int, int));
struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *));
int get_hoplim __P((struct msghdr *));
double deltaT __P((struct timeval *, struct timeval *));
char *pr_type __P((int));
int packet_ok __P((struct msghdr *, int, int));
void print __P((struct msghdr *, int));
void tvsub __P((struct timeval *, struct timeval *));
const char *inetname __P((struct sockaddr *));
void usage __P((void));
int rcvsock; /* receive (icmp) socket file descriptor */
int sndsock; /* send (udp) socket file descriptor */
struct timezone tz; /* leftover */
struct msghdr rcvmhdr;
struct iovec rcviov[2];
int rcvhlim;
struct in6_pktinfo *rcvpktinfo;
struct sockaddr_in6 Src, Dst, Rcv;
int datalen; /* How much data */
/* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
char rtbuf[2064];
#ifdef USE_RFC2292BIS
struct ip6_rthdr *rth;
#endif
struct cmsghdr *cmsg;
char *source = 0;
char *hostname;
int nprobes = 3;
int first_hop = 1;
int max_hops = 30;
u_short ident;
u_short port = 32768+666; /* start udp dest port # for probe packets */
int options; /* socket options */
int verbose;
int waittime = 5; /* time to wait for response (in seconds) */
int nflag; /* print addresses numerically */
int lflag; /* print both numerical address & hostname */
#ifdef KAME_SCOPEID
const int niflag = NI_WITHSCOPEID;
#else
const int niflag = 0;
#endif
int
main(argc, argv)
int argc;
char *argv[];
{
struct hostent *hp;
int error;
struct addrinfo hints, *res;
int ch, i, on, probe, seq, hops, rcvcmsglen;
static u_char *rcvcmsgbuf;
char hbuf[NI_MAXHOST], src0[NI_MAXHOST];
char *ep;
/*
* Receive ICMP
*/
if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
perror("socket(ICMPv6)");
exit(5);
}
/* revoke privs */
seteuid(getuid());
setuid(getuid());
/* set a minimum set of socket options */
on = 1;
/* specify to tell receiving interface */
#ifdef IPV6_RECVPKTINFO
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_RECVPKTINFO)");
#else /* old adv. API */
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_PKTINFO)");
#endif
/* specify to tell value of hoplimit field of received IP6 hdr */
#ifdef IPV6_RECVHOPLIMIT
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
#else /* old adv. API */
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
sizeof(on)) < 0)
err(1, "setsockopt(IPV6_HOPLIMIT)");
#endif
seq = 0;
while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1)
switch(ch) {
case 'd':
options |= SO_DEBUG;
break;
case 'f':
ep = NULL;
first_hop = strtoul(optarg, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: invalid min hoplimit.\n");
exit(1);
}
if (first_hop > max_hops) {
Fprintf(stderr,
"traceroute6: min hoplimit must be <= %d.\n", max_hops);
exit(1);
}
break;
case 'g':
hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
if (hp == NULL) {
Fprintf(stderr,
"traceroute6: unknown host %s\n", optarg);
exit(1);
}
#ifdef USE_RFC2292BIS
if (rth == NULL) {
/*
* XXX: We can't detect the number of
* intermediate nodes yet.
*/
if ((rth = inet6_rth_init((void *)rtbuf,
sizeof(rtbuf),
IPV6_RTHDR_TYPE_0,
0)) == NULL) {
Fprintf(stderr,
"inet6_rth_init failed.\n");
exit(1);
}
}
if (inet6_rth_add((void *)rth,
(struct in6_addr *)hp->h_addr)) {
Fprintf(stderr,
"inet6_rth_add failed for %s\n",
optarg);
exit(1);
}
#else /* old advanced API */
if (cmsg == NULL)
cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
#endif
freehostent(hp);
break;
case 'l':
lflag++;
break;
case 'm':
ep = NULL;
max_hops = strtoul(optarg, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: invalid max hoplimit.\n");
exit(1);
}
if (max_hops < first_hop) {
Fprintf(stderr,
"traceroute6: max hoplimit must be >= %d.\n", first_hop);
exit(1);
}
break;
case 'n':
nflag++;
break;
case 'p':
ep = NULL;
port = strtoul(optarg, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: port.\n");
exit(1);
}
if (port < 1) {
Fprintf(stderr,
"traceroute6: port must be >0.\n");
exit(1);
}
break;
case 'q':
ep = NULL;
nprobes = strtoul(optarg, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: invalid nprobes.\n");
exit(1);
}
if (nprobes < 1) {
Fprintf(stderr,
"traceroute6: nprobes must be >0.\n");
exit(1);
}
break;
case 'r':
options |= SO_DONTROUTE;
break;
case 's':
/*
* set the ip source address of the outbound
* probe (e.g., on a multi-homed host).
*/
source = optarg;
break;
case 'v':
verbose++;
break;
case 'w':
ep = NULL;
waittime = strtoul(optarg, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: invalid wait time.\n");
exit(1);
}
if (waittime <= 1) {
Fprintf(stderr,
"traceroute6: wait must be >1 sec.\n");
exit(1);
}
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1 || argc > 2)
usage();
#if 1
setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
#else
setlinebuf (stdout);
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_RAW;
hints.ai_protocol = IPPROTO_ICMPV6;
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(*argv, NULL, &hints, &res);
if (error) {
(void)fprintf(stderr,
"traceroute6: %s\n", gai_strerror(error));
exit(1);
}
if (res->ai_addrlen != sizeof(Dst)) {
(void)fprintf(stderr,
"traceroute6: size of sockaddr mismatch\n");
exit(1);
}
memcpy(&Dst, res->ai_addr, res->ai_addrlen);
hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
if (!hostname) {
(void)fprintf(stderr, "traceroute6: not enough core\n");
exit(1);
}
if (*++argv) {
ep = NULL;
datalen = strtoul(*argv, &ep, 0);
if (!*argv || *ep) {
Fprintf(stderr,
"traceroute6: invalid packet length.\n");
exit(1);
}
}
if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
Fprintf(stderr,
"traceroute6: packet size must be 0 <= s < %ld.\n",
(long)(MAXPACKET - sizeof(struct opacket)));
exit(1);
}
datalen += sizeof(struct opacket);
outpacket = (struct opacket *)malloc((unsigned)datalen);
if (! outpacket) {
perror("malloc");
exit(1);
}
(void) bzero((char *)outpacket, datalen);
/* initialize msghdr for receiving packets */
rcviov[0].iov_base = (caddr_t)packet;
rcviov[0].iov_len = sizeof(packet);
rcvmhdr.msg_name = (caddr_t)&Rcv;
rcvmhdr.msg_namelen = sizeof(Rcv);
rcvmhdr.msg_iov = rcviov;
rcvmhdr.msg_iovlen = 1;
rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo))
+ CMSG_SPACE(sizeof(int));
if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
Fprintf(stderr, "traceroute6: malloc failed\n");
exit(1);
}
rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
rcvmhdr.msg_controllen = rcvcmsglen;
if (options & SO_DEBUG)
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
(char *)&on, sizeof(on));
if (options & SO_DONTROUTE)
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
(char *)&on, sizeof(on));
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
/*
* do not raise error even if setsockopt fails, kernel may have ipsec
* turned off.
*/
if (setpolicy(rcvsock, "in bypass") < 0)
errx(1, "%s", ipsec_strerror());
if (setpolicy(rcvsock, "out bypass") < 0)
errx(1, "%s", ipsec_strerror());
#else
{
int level = IPSEC_LEVEL_NONE;
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
sizeof(level));
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
sizeof(level));
#ifdef IP_AUTH_TRANS_LEVEL
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
sizeof(level));
#else
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
sizeof(level));
#endif
#ifdef IP_AUTH_NETWORK_LEVEL
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
sizeof(level));
#endif
}
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
/*
* Send UDP
*/
if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
perror("socket(SOCK_DGRAM)");
exit(5);
}
#ifdef SO_SNDBUF
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
sizeof(datalen)) < 0) {
perror("setsockopt(SO_SNDBUF)");
exit(6);
}
#endif /* SO_SNDBUF */
if (options & SO_DEBUG)
(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
(char *)&on, sizeof(on));
if (options & SO_DONTROUTE)
(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
(char *)&on, sizeof(on));
#ifdef USE_RFC2292BIS
if (rth) {/* XXX: there is no library to finalize the header... */
rth->ip6r_len = rth->ip6r_segleft * 2;
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
(void *)rth, (rth->ip6r_len + 1) << 3)) {
Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
strerror(errno));
exit(1);
}
}
#else /* old advanced API */
if (cmsg != NULL) {
inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
rtbuf, cmsg->cmsg_len) < 0) {
Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
strerror(errno));
exit(1);
}
}
#endif /* USE_RFC2292BIS */
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
/*
* do not raise error even if setsockopt fails, kernel may have ipsec
* turned off.
*/
if (setpolicy(sndsock, "in bypass") < 0)
errx(1, "%s", ipsec_strerror());
if (setpolicy(sndsock, "out bypass") < 0)
errx(1, "%s", ipsec_strerror());
#else
{
int level = IPSEC_LEVEL_BYPASS;
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
sizeof(level));
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
sizeof(level));
#ifdef IP_AUTH_TRANS_LEVEL
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
sizeof(level));
#else
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
sizeof(level));
#endif
#ifdef IP_AUTH_NETWORK_LEVEL
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
sizeof(level));
#endif
}
#endif /*IPSEC_POLICY_IPSEC*/
#endif /*IPSEC*/
/*
* Source selection
*/
bzero(&Src, sizeof(Src));
if (source) {
struct addrinfo hints, *res;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
hints.ai_flags = AI_NUMERICHOST;
error = getaddrinfo(source, "0", &hints, &res);
if (error) {
Printf("traceroute6: %s: %s\n", source,
gai_strerror(error));
exit(1);
}
if (res->ai_addrlen > sizeof(Src)) {
Printf("traceroute6: %s: %s\n", source,
gai_strerror(error));
exit(1);
}
memcpy(&Src, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
} else {
struct sockaddr_in6 Nxt;
int dummy, len;
Nxt = Dst;
Nxt.sin6_port = htons(DUMMY_PORT);
if (cmsg != NULL)
bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
sizeof(Nxt.sin6_addr));
if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
perror("socket");
exit(1);
}
if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
perror("connect");
exit(1);
}
len = sizeof(Src);
if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
perror("getsockname");
exit(1);
}
if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
src0, sizeof(src0), NULL, 0,
NI_NUMERICHOST | niflag)) {
Fprintf(stderr, "getnameinfo failed for source\n");
exit(1);
}
source = src0;
close(dummy);
}
#if 1
ident = (getpid() & 0xffff) | 0x8000;
#else
ident = 0; /*let the kernel pick one*/
#endif
Src.sin6_port = htons(ident);
if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
perror("bind");
exit(1);
}
if (ident == 0) {
int len;
len = sizeof(Src);
if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) {
perror("getsockname");
exit(1);
}
ident = ntohs(Src.sin6_port);
}
/*
* Message to users
*/
if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag))
strlcpy(hbuf, "(invalid)", sizeof(hbuf));
Fprintf(stderr, "traceroute6");
Fprintf(stderr, " to %s (%s)", hostname, hbuf);
if (source)
Fprintf(stderr, " from %s", source);
Fprintf(stderr,
", %d hops max, %d byte packets\n",
max_hops, datalen);
(void) fflush(stderr);
if (first_hop > 1)
Printf("Skipping %d intermediate hops\n", first_hop - 1);
/*
* Main loop
*/
for (hops = first_hop; hops <= max_hops; ++hops) {
struct in6_addr lastaddr;
int got_there = 0;
int unreachable = 0;
Printf("%2d ", hops);
bzero(&lastaddr, sizeof(lastaddr));
for (probe = 0; probe < nprobes; ++probe) {
int cc;
struct timeval t1, t2;
struct timezone tz;
(void) gettimeofday(&t1, &tz);
send_probe(++seq, hops);
while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
(void) gettimeofday(&t2, &tz);
if ((i = packet_ok(&rcvmhdr, cc, seq))) {
if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
&lastaddr)) {
print(&rcvmhdr, cc);
lastaddr = Rcv.sin6_addr;
}
Printf(" %g ms", deltaT(&t1, &t2));
switch(i - 1) {
case ICMP6_DST_UNREACH_NOROUTE:
++unreachable;
Printf(" !N");
break;
case ICMP6_DST_UNREACH_ADMIN:
++unreachable;
Printf(" !P");
break;
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
++unreachable;
Printf(" !S");
break;
case ICMP6_DST_UNREACH_ADDR:
++unreachable;
Printf(" !A");
break;
case ICMP6_DST_UNREACH_NOPORT:
if (rcvhlim >= 0 &&
rcvhlim <= 1)
Printf(" !");
++got_there;
break;
}
break;
}
}
if (cc == 0)
Printf(" *");
(void) fflush(stdout);
}
putchar('\n');
if (got_there ||
(unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
exit(0);
}
}
exit(0);
}
int
wait_for_reply(sock, mhdr)
int sock;
struct msghdr *mhdr;
{
#ifdef HAVE_POLL
struct pollfd pfd[1];
int cc = 0;
pfd[0].fd = sock;
pfd[0].events = POLLIN;
pfd[0].revents = 0;
if (poll(pfd, 1, waittime * 1000) > 0)
cc = recvmsg(rcvsock, mhdr, 0);
return(cc);
#else
fd_set *fdsp;
struct timeval wait;
int cc = 0, fdsn;
fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
err(1, "malloc");
memset(fdsp, 0, fdsn);
FD_SET(sock, fdsp);
wait.tv_sec = waittime; wait.tv_usec = 0;
if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
cc = recvmsg(rcvsock, mhdr, 0);
free(fdsp);
return(cc);
#endif
}
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
int
setpolicy(so, policy)
int so;
char *policy;
{
char *buf;
buf = ipsec_set_policy(policy, strlen(policy));
if (buf == NULL) {
warnx("%s", ipsec_strerror());
return -1;
}
(void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
buf, ipsec_get_policylen(buf));
free(buf);
return 0;
}
#endif
#endif
void
send_probe(seq, hops)
int seq, hops;
{
struct opacket *op = outpacket;
int i;
if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
(char *)&hops, sizeof(hops)) < 0) {
perror("setsockopt IPV6_UNICAST_HOPS");
}
Dst.sin6_port = htons(port + seq);
op->seq = seq;
op->hops = hops;
(void) gettimeofday(&op->tv, &tz);
i = sendto(sndsock, (char *)outpacket, datalen , 0,
(struct sockaddr *)&Dst, Dst.sin6_len);
if (i < 0 || i != datalen) {
if (i<0)
perror("sendto");
Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
datalen, i);
(void) fflush(stdout);
}
}
int
get_hoplim(mhdr)
struct msghdr *mhdr;
{
struct cmsghdr *cm;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_HOPLIMIT &&
cm->cmsg_len == CMSG_LEN(sizeof(int)))
return(*(int *)CMSG_DATA(cm));
}
return(-1);
}
double
deltaT(t1p, t2p)
struct timeval *t1p, *t2p;
{
register double dt;
dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
(double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
return (dt);
}
/*
* Convert an ICMP "type" field to a printable string.
*/
char *
pr_type(t0)
int t0;
{
u_char t = t0 & 0xff;
char *cp;
switch (t) {
case ICMP6_DST_UNREACH:
cp = "Destination Unreachable";
break;
case ICMP6_PACKET_TOO_BIG:
cp = "Pakcet Too Big";
break;
case ICMP6_TIME_EXCEEDED:
cp = "Time Exceeded";
break;
case ICMP6_PARAM_PROB:
cp = "Parameter Problem";
break;
case ICMP6_ECHO_REQUEST:
cp = "Echo Request";
break;
case ICMP6_ECHO_REPLY:
cp = "Echo Reply";
break;
case ICMP6_MEMBERSHIP_QUERY:
cp = "Group Membership Query";
break;
case ICMP6_MEMBERSHIP_REPORT:
cp = "Group Membership Report";
break;
case ICMP6_MEMBERSHIP_REDUCTION:
cp = "Group Membership Reduction";
break;
case ND_ROUTER_SOLICIT:
cp = "Router Solicitation";
break;
case ND_ROUTER_ADVERT:
cp = "Router Advertisement";
break;
case ND_NEIGHBOR_SOLICIT:
cp = "Neighbor Solicitation";
break;
case ND_NEIGHBOR_ADVERT:
cp = "Neighbor Advertisement";
break;
case ND_REDIRECT:
cp = "Redirect";
break;
default:
cp = "Unknown";
break;
}
return cp;
}
int
packet_ok(mhdr, cc, seq)
struct msghdr *mhdr;
int cc;
int seq;
{
register struct icmp6_hdr *icp;
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
u_char type, code;
char *buf = (char *)mhdr->msg_iov[0].iov_base;
struct cmsghdr *cm;
int *hlimp;
char hbuf[NI_MAXHOST];
#ifdef OLDRAWSOCKET
int hlen;
struct ip6_hdr *ip;
#endif
#ifdef OLDRAWSOCKET
ip = (struct ip6_hdr *) buf;
hlen = sizeof(struct ip6_hdr);
if (cc < hlen + sizeof(struct icmp6_hdr)) {
if (verbose) {
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
hbuf, sizeof(hbuf), NULL, 0,
NI_NUMERICHOST | niflag) != 0)
strlcpy(hbuf, "invalid", sizeof(hbuf));
Printf("packet too short (%d bytes) from %s\n", cc,
hbuf);
}
return (0);
}
cc -= hlen;
icp = (struct icmp6_hdr *)(buf + hlen);
#else
if (cc < sizeof(struct icmp6_hdr)) {
if (verbose) {
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
hbuf, sizeof(hbuf), NULL, 0,
NI_NUMERICHOST | niflag) != 0)
strlcpy(hbuf, "invalid", sizeof(hbuf));
Printf("data too short (%d bytes) from %s\n", cc, hbuf);
}
return(0);
}
icp = (struct icmp6_hdr *)buf;
#endif
/* get optional information via advanced API */
rcvpktinfo = NULL;
hlimp = NULL;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO &&
cm->cmsg_len ==
CMSG_LEN(sizeof(struct in6_pktinfo)))
rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_HOPLIMIT &&
cm->cmsg_len == CMSG_LEN(sizeof(int)))
hlimp = (int *)CMSG_DATA(cm);
}
if (rcvpktinfo == NULL || hlimp == NULL) {
warnx("failed to get received hop limit or packet info");
#if 0
return(0);
#else
rcvhlim = 0; /*XXX*/
#endif
}
else
rcvhlim = *hlimp;
type = icp->icmp6_type;
code = icp->icmp6_code;
if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|| type == ICMP6_DST_UNREACH) {
struct ip6_hdr *hip;
struct udphdr *up;
hip = (struct ip6_hdr *)(icp + 1);
if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
if (verbose)
warnx("failed to get upper layer header");
return(0);
}
if (up->uh_sport == htons(ident) &&
up->uh_dport == htons(port+seq))
return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
}
if (verbose) {
int i;
u_int8_t *p;
char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
strlcpy(sbuf, "invalid", sizeof(hbuf));
Printf("\n%d bytes from %s to %s", cc, sbuf,
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
dbuf, sizeof(dbuf))
: "?");
Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
icp->icmp6_code);
p = (u_int8_t *)(icp + 1);
#define WIDTH 16
for (i = 0; i < cc; i++) {
if (i % WIDTH == 0)
Printf("%04x:", i);
if (i % 4 == 0)
Printf(" ");
Printf("%02x", p[i]);
if (i % WIDTH == WIDTH - 1)
Printf("\n");
}
if (cc % WIDTH != 0)
Printf("\n");
}
return(0);
}
/*
* Increment pointer until find the UDP header.
*/
struct udphdr *
get_udphdr(ip6, lim)
struct ip6_hdr *ip6;
u_char *lim;
{
u_char *cp = (u_char *)ip6, nh;
int hlen;
if (cp + sizeof(*ip6) >= lim)
return(NULL);
nh = ip6->ip6_nxt;
cp += sizeof(struct ip6_hdr);
while(lim - cp >= 8) {
switch(nh) {
case IPPROTO_ESP:
case IPPROTO_TCP:
case IPPROTO_ICMPV6:
return(NULL);
case IPPROTO_UDP:
return((struct udphdr *)cp);
case IPPROTO_FRAGMENT:
hlen = sizeof(struct ip6_frag);
nh = ((struct ip6_frag *)cp)->ip6f_nxt;
break;
case IPPROTO_AH:
hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
break;
default:
hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
break;
}
cp += hlen;
}
return(NULL);
}
void
print(mhdr, cc)
struct msghdr *mhdr;
int cc;
{
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
char hbuf[NI_MAXHOST];
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
strlcpy(hbuf, "invalid", sizeof(hbuf));
if (nflag)
Printf(" %s", hbuf);
else if (lflag)
Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
else
Printf(" %s", inetname((struct sockaddr *)from));
if (verbose) {
#ifdef OLDRAWSOCKET
Printf(" %d bytes to %s", cc,
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
hbuf, sizeof(hbuf))
: "?");
#else
Printf(" %d bytes of data to %s", cc,
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
hbuf, sizeof(hbuf))
: "?");
#endif
}
}
/*
* Subtract 2 timeval structs: out = out - in.
* Out is assumed to be >= in.
*/
void
tvsub(out, in)
register struct timeval *out, *in;
{
if ((out->tv_usec -= in->tv_usec) < 0) {
out->tv_sec--;
out->tv_usec += 1000000;
}
out->tv_sec -= in->tv_sec;
}
/*
* Construct an Internet address representation.
* If the nflag has been supplied, give
* numeric value, otherwise try for symbolic name.
*/
const char *
inetname(sa)
struct sockaddr *sa;
{
register char *cp;
static char line[NI_MAXHOST];
static char domain[MAXHOSTNAMELEN + 1];
static int first = 1;
if (first && !nflag) {
first = 0;
if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
(cp = index(domain, '.')))
(void) strlcpy(domain, cp + 1, sizeof(domain));
else
domain[0] = 0;
}
cp = NULL;
if (!nflag) {
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
NI_NAMEREQD) == 0) {
if ((cp = index(line, '.')) &&
!strcmp(cp + 1, domain))
*cp = 0;
cp = line;
}
}
if (cp)
return cp;
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
NI_NUMERICHOST | niflag) != 0)
strlcpy(line, "invalid", sizeof(line));
return line;
}
void
usage()
{
(void)fprintf(stderr,
"usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n"
" [-q probes] [-s src] [-w waittime] target [datalen]\n");
exit(1);
}
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